Alveoli are tiny sacs found in the lungs of mammals to help with rapid gas exchange (breathing). Alveoli actually comes from the Latin for little cavity, and this is what they look like in the lungs, tiny holes that are vital to breathing (you can also find a different type of alveoli in teeth).

The membrane of the sac itself is a gas exchange surface through diffusion, where the carbon dioxide ri... more

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Claire Jeffrey
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